Draw a large curved outline like a flattened bean
Make the right side broader and the left side narrower
Add a slight dip along the top edge
Sketch a smaller notch near the lower center
Refine the outer contour with smooth rounded lines
Add the gallbladder as a small pear-shaped form on the underside
Draw the main blood vessel lines branching across the surface if needed
Erase extra construction lines
Darken the final outline
Shade lightly to show form and depth